WASHINGTON — Now that the fight over Obamacare is history, perhaps everyone can finally focus on making the program work the way it was designed. Or, preferably, better.

The fight is history, you realize. Done. Finito. Yesterday’s news.

Any existential threat to the Affordable Care Act ended with the popping of champagne corks as the new year arrived. That was when an estimated 6 million uninsured Americans received coverage through expanded Medicaid eligibility or the federal and state health insurance exchanges. Obamacare is now a fait accompli; nobody is going to take this coverage away.

There may be more huffing, puffing and symbolic attempts at repeal by Republicans in Congress. There may be continued resistance and sabotage by Republican governors and GOP-controlled state legislatures. But the whole context has changed.

Now, officials in states that refused to participate in Medicaid expansion will have to explain why so many of their constituents — about 5 million nationwide — remain uninsured when they could have qualified for coverage. More than 1 million of these needlessly uninsured Americans live in Texas, which is targeted by Democrats as ripe for inroads because of its rapidly changing demographics. Will Gov. Rick Perry be forced to reconsider his Obamacare rejectionism? Or will he ultimately be remembered for speeding the state’s transition from red to blue?

Performance of the federal insurance exchange website, HealthCare.gov, will continue to improve, if only because the initial flood of applicants is bound to subside. Meanwhile, insurance costs and benefits in states that refused to set up their own exchanges will be compared with those in states that did. There will be questions about how the new law is performing — but no one will be able to pretend it does not exist.

Opponents of the law can hardly advocate going back to a system in which those who really need insurance can’t get it. What they can do, and surely will, is make lots of noise by pretending that any problem with anyone’s health insurance is due to the Affordable Care Act. Before Obamacare, millions of Americans had their policies canceled by the insurance companies every year. Millions more had their premiums raised, their overage reduced, or both. Now when these things happen, critics will try to blame the new law.

Increasingly, though, the GOP will sound foolish and irrelevant if it continues to put all of its eggs in the “repeal and replace” basket. The problem is that the Affordable Care Act is a set of free-market reforms based on ideas developed in conservative think tanks. Republicans who want to repeal Obamacare would have to replace it with something suspiciously similar.

Note to the GOP: “We refuse, under any circumstances, to make the law work better for the citizens we represent” is perhaps not the ideal campaign slogan for the midterm election.

The real problem with the ACA, and let’s be honest, is that it doesn’t go far enough. The decision to work within the existing framework of private, for-profit insurance companies meant building a tremendously complicated new system that still doesn’t quite get the job done: Even if all the states were fully participating, only about 30 million of the 48 million uninsured would be covered.

But Obamacare does establish the principle that health care is a right, not a privilege — and that this is true not just for children, the elderly and the poor but for all Americans.

Throughout the nation’s history, it has taken long, hard work to win universal recognition of what we consider our basic rights. Perhaps future legislation will expand and streamline the ACA reforms until everyone is covered. Or perhaps we’ll move toward a single-payer system, possibly by expanding Medicare and Medicaid until they meet in the middle.

I don’t know how we’ll get there, but we’re now on the road to universal health care. There’s no turning back.